Avestan language in the context of "Ahura"

Old Persian is one of two directly attested Old Iranian languages (the other being Avestan) and is the ancestor of Middle Persian (the language of the Sasanian Empire). Like other Old Iranian languages, it was known to its native speakers as ariya (Iranian). Old Persian is close to both Avestan and Vedic Sanskrit, and all three languages are highly inflected.

Old Persian appears primarily in the inscriptions, clay tablets and seals of the Achaemenid era (c. 600 BCE to 300 BCE). Examples of Old Persian have been found in what is now Iran, Romania (Gherla), Armenia, Bahrain, Iraq, Turkey and Egypt, with the most important attestation by far being the contents of the Behistun Inscription (dated to 522 BCE).

Historically, Iran was commonly referred to as "Persia" in the Western world. Likewise, the modern-day ethnonym "Persian" was typically used as a demonym for all Iranian nationals, regardless of whether or not they were ethnic Persians. This terminology prevailed until 1935, when, during an international gathering for Nowruz, the Iranian king Reza Shah Pahlavi officially requested that foreign delegates begin using the endonym "Iran" in formal correspondence. Subsequently, "Iran" and "Iranian" were standardized as the terms referring to the country and its citizens, respectively. Later, in 1959, Pahlavi's son Mohammad Reza Pahlavi announced that it was appropriate to use both "Persia" and "Iran" in formal correspondence. A variety of scholars from the Middle Ages, such as the Khwarazmian polymath Al-Biruni, also used terms like "Xuniras" (Avestan: Xvaniraθa-, transl. "self-made, not resting on anything else") to refer to Iran: "which is the center of the world, [...] and it is the one wherein we are, and the kings called it the Iranian realm."

Angra Mainyu (/ˈæŋrə ˈmaɪnjuː/; Avestan: 𐬀𐬢𐬭𐬀⸱𐬨𐬀𐬌𐬥𐬌𐬌𐬎, romanized: Aŋra Maniiu) is the Avestan name of Zoroastrianism's hypostasis of the "destructive/evil spirit" and the main adversary in Zoroastrianism either of the Spenta Mainyu, the "holy/creative spirits/mentality", or directly of Ahura Mazda, the highest deity of Zoroastrianism. The Middle Persian equivalent is Ahriman (/ˈɑːrɪmən/; Middle Persian: 𐭠𐭧𐭫𐭬𐭭𐭩, romanized: Ahreman). The name can appear in English-language works as Ahrimanes.

Frashokereti (Avestan: 𐬟𐬭𐬀𐬴𐬋⸱𐬐𐬆𐬭𐬆𐬙𐬌 frašō.kərəti) is the Avestan language term (corresponding to Middle Persian 𐭯𐭫𐭱(𐭠)𐭪𐭥𐭲 fraš(a)gird <plškrt>) for the Zoroastrian doctrine of a final renovation of the universe, when evil will be destroyed, and everything else will be then in perfect unity with God (Ahura Mazda).

The doctrinal premises are (1) good will eventually prevail over evil; (2) creation was initially perfectly good, but was subsequently corrupted by evil; (3) the world will ultimately be restored to the perfection it had at the time of creation; (4) the "salvation for the individual depended on the sum of [that person's] thoughts, words and deeds, and there could be no intervention, whether compassionate or capricious, by any divine being to alter this." Thus, each human bears the responsibility for the fate of his own soul, and simultaneously shares in the responsibility for the fate of the world.

Arya (Avestan: 𐬀𐬌𐬭𐬌𐬌𐬀, airiia; Old Persian: 𐎠𐎼𐎡𐎹, ariyaʰ; Middle Persian: 𐭠𐭩𐭫‎, er; Parthian: 𐭀𐭓𐭉‎, ary; Bactrian: αρια, aria) was the ethnonym used by Iranians during the early History of Iran. In contrast to cognates of Arya used by the Vedic people and Iranic steppe nomads, the term is commonly translated using the modern ethnonym Iranian.

During Old Iranian times, the term was connected with one's lineage, with speaking an Iranian language and with the worship of Ahura Mazda. Being an Arya, therefore, had ethnic, linguistic and religious aspects. During the Middle Iranian period, it acquired a distinct political aspect through the concept of Eran Shahr (Aryas' dominion). Arya was also contrasted with Anarya (Avestan: 𐬀𐬥𐬀𐬌𐬭𐬌𐬌𐬀, anairiia; Middle Persian: 𐭠𐭭𐭩𐭥‎, aner), denoting non-Iranian lands and peoples.

In the Avesta, reference is made to seven karshvar (Avestan: 𐬐𐬀𐬭𐬀𐬱𐬀𐬎𐬎𐬀𐬭𐬀‎, romanized: karšvar, lit. 'delineated land' > Persian: kišvar), climes or zones, organizing the world map into a seven-storied ziggurat representing the cosmic mountain. The world is referred to as the haft keshvar "seven climes". The word has also been translated as "region", "state" or "continent".

The Avesta describes the karshvar as superimposed concentric circles one above the other, with increasing size. These are separated by waters, mountains or forests.

Yasna (/ˈjʌsnə/; Avestan: 𐬫𐬀𐬯𐬥𐬀) is the Avestan name of both a text within the Avesta collection and of the Yasna liturgy, Zoroastrianism's principal act of worship.

Airyanem Vaejah (Avestan: 𐬀𐬌𐬭𐬌𐬌𐬀𐬥𐬆𐬨⸱𐬬𐬀𐬉𐬘𐬀𐬵, romanized: airiianəm vaējah; Middle Persian: Ērān-wēz; Persian: Irānwēj; Parthian: Aryānwēžan, 'the Arya Expanse') is considered in Zoroastrianism to be the homeland of the early Iranians and the place where Zarathustra received the religion from Ahura Mazda. The Avesta also names it as the first of the "sixteen perfect lands" that Ahura Mazda created for the Iranians.

Based on these descriptions, modern scholarship initially focused on Airyanem Vaejah in an attempt to determine the homeland of the Iranians or Indo-Iranians in general. Among these early attempts, the region of Khwarezm emerged as a likely locale. More recent scholarship, however, no longer agrees as to where Airyanem Vaejah might have been located or to what extent it is a mythological rather than a specific historical place.